Question

2 isotopes of an element are present in 1:2 ratio of number, having mass number M and M+0.5 respectively. The mean mass number of element will be

Answer 1

Explanation:

Mean Mass number is the average mass of all isotopes.

So, Mean Mass Number =

1+2

1×M +(M+0.5)×2

=M+

3

1

Answer 2

Answer:

Mean Mass number is the average mass of all isotopes.

So, Mean Mass Number  =1×M +(M+0.5)×2

=3M +1

=M+1/3      (multiplying by 1/3)

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Explanation: